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It does a lot of things!
I study electronic engineering and it is the coolest web tool :) Something like a web based mathematica
Few examples:
integral sin(x)*sin(x)
inverse laplace transform 1/(s+3)
plane for (1,1,1) (0,0,1) and (1,2,3)
RLC circuit 1ohm, 3nH,1pF
Or roughly analyzing my computer consume: 0.25 €/kwh * 650W * 1 month
or you can ask it what ...

try this
Go to http://page2rss.com
Paste the page address you wish to monitor in the "Page URL to RSS" bar
Copy the RSS Feed URL from "To receive updates for this page in RSS format copy-paste this link into your feed reader." or from the "Subscribe to Feed" on the right hand side of the page.
Use this link in IFTTT RSS Trigger.
Not sure how instant it ...

This blog has a pretty good outline of Saas vs PaaS vs IaaS and compares what Google, Amazon, Azure and other "cloud" providers offer. Here's generally how they breakdown:
For more information check out this blog post about how Cloud computing compares vs traditional dedicated servers or VPS/VMs. or this post specific for Azure terms and definitions.

Some info can be found here:
http://www.alexa.com/help/traffic_learn_more
The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and data obtained from other, diverse traffic data sources, and is a combined measure of page views and users (reach). As a first step, Alexa computes the reach ...

If you own the website then Google Analytics is the way to go.
If you don't own the website then it'll be a lot trickier. You can use something like Alexa ranks to track traffic generically, but that won't tell you anything about specific traffic.
Or if you'd rather track the traffic you are sending to that page from your link I'd suggest linking to the ...

There's a link called "edit subject" that you click on to reveal the text box for the subject line.
But you shouldn't change the subject line, unless your reply really has a different topic (subject)! Here's why:
For one thing, if you edit the line just to remove "RE:" then Gmail will treat the message as a new thread and won't match it to the existing ...

As I see it, SaaS is a subset of Cloud. SaaS specifically relates to Software that makes use of the Cloud. There are other Cloud technologies like IaaS (Infrastructure as a Service), PaaS (Platform as a Service, e.g. Force.com, Google App Engine), storage (e.g. Amazon S3) and so on...
As for ASP, I think that's pretty much synonymous with SaaS...

Pinterest is tricky with this.
Use the following link http://pinterest.com/<yourUsername>/following/
The way the un-follow button works is a tad decieving but it works
It looks disabled even on rollover, but clicking it does indeed un-follow a user.

You would need to encode the encoded space - effectively, it looks like the LinkedIn.com website is unencoding the %20 to an actual space, which it then runs through a verification check which fails, as spaces in URLs are not supported.
So if you want to have a site with a URL like:
http://www.example.com/?id=this%20rocks
You'd need to enter:
...

You'd probably have to write your own youtube player to do it. They have coded it this way on purpose, it really cuts down on the bandwidth on youtube's servers. Think about all the people that might visit a site, but not click the button...they would still download the file anyways, wasting both their and google's bandwidth.

Upload your KML file anywhere on the web. You can use any of the free upload services out there (see Online File Storage Services for a list of options). Then, go to Google Maps and enter the exact URL of the KML file into the search bar. The KML will be loaded into Google Maps in your browser.
For example, entering ...

The important thing is the domain of the link. When you hover on that link, if the URL that shows up (usually at the bottom left of the browser window) starts with http://facebook.com or https://facebook.com, then it is safe no matter what follows the site root.
That being said, the link you gave opens a Facebook page to Report Mistaken Email. It says:
...

In case of Gmail it depends on how you delete it.
Google support writes about possibilities of regaining your username depending on how you have deleted your account.
Recovering a deleted username
Canceling your Gmail address
Therefore, it seems that your username won't be available for others to use in any case.

How about Ragic?
You can create forms like a spreadsheet, and open it to the public so everyone can create entries on it. It also have access right management to control whether the user can see or be able to modify an entry. And it's web based like you asked.

there's quite a few. I'm fond of dropbox for this - while its primarily a file sync application, using the public folder allows you to give a direct link.
Both the desktop application and web interface work well, and its free for 2gb + some bonus space.

I think you're referring to Prezi - it has a unique navigation mechanism. Makes the presentation interesting and eye catching - but don't be tempted to use all the available visual effects in it, or you'll leave your crowd with vertigo :)

Here's another good blog post about the frustrations of using Wolfram|Alpha. Until they work out the user interface problems, W|A will remain a curiosity. Once they do, a user should be able to fulfill the promise of being able to synthesize new ideas by juxtaposing data in new ways.
In the mean time, I only play around with it. There's very little depth I ...

It should be working (though of course from myblog.blogspot.com to www.myblog.com - because myblog.blogger.com does not exist).
There's a post in Blogger's "Known Problems" blog this morning saying that custom-redirects are currently suspended. This makes me think that there's a fairly serious issue with this feature at present - they don't usually admit ...